In Java 8, you can use a method reference to filter a stream, for example: Stream<String> s = ...; long emptyStrings = s.filter(String::isEmpty).count(); Is there a way to create a method ...

I'm seeking for a way to negate an expression used to filter IQueryable sequences. So, I've got something like: Expression<Func<T, bool>> expression = (x => true); Now I wish to ...

Is there a built-in function to add a new column which is the negation of the original column? Spark SQL has the function negative(). Pyspark does not seem to have inherited this function. df_new...

if myval == 0: nyval=1 if myval == 1: nyval=0 Is there a better way to do a toggle in python, like a nyvalue = not myval ?

I'm looking for a simple, but cross-platform negate-process that negates the value a process returns. It should map 0 to some value != 0 and any value != 0 to 0, i.e. the following command should r...

When dealing with generic code in C++, I would find a std::identity functor (like std::negate) very useful. Is there a particular reason why this is not present in the standard library?

Is it possible to negate a where clause? e.g. DELETE * FROM table WHERE id != 2;

I want to select columns from my tibble that end with the letter R AND do NOT start with a character string ("hc"). For instance, if I have a dataframe that looks like this: name hc_1 hc_2 hc_3r h...

I want to convert a positive value to a negative value, for example: let a: Int = 10 turn it to -10, my current idea is just use it to multiple -1 a * -1 I'm not sure if this is proper, any i...

Using GNU bash (version 4.0.35(1)-release (x86_64-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable...

I'm stuck at trying to negate the following command: wget -q --tries=10 --timeout=20 --spider http://google.com if [[ $? -eq 0 ]]; then echo "Sorry you are Offline" exit 1 This if cond...

I'm writing some script now and I have a problem when trying to negate boolean inside a function. I mean this: var test = true; function changeThisBoolPlease(asd){ asd=!asd; } alert(test)...

trying to find absolute value and i thought there was a simple way to just invert the sign with '~' or something.

How would I use a negative form of Python's isinstance()? Normally negation would work something like x != 1 if x not in y if not a I just haven't seen an example with isinstance(), so I'd l...

Got some weird behavior I was wondering if someone could clear up for me. Check it out $hex = 0x80008000; print_r(decbin(intval($hex)) . '<br/>'); print_r(decbin($hex)); Outputs 1000000...

I am using a javascript validator which will let me build custom validation based on regexp From their website: regexp=^[A-Za-z]{1,20}$ allow up to 20 alphabetic characters. This will return an e...

I want to select elements, but not if one of their ancestor matches a certain selector. For example, let's say I want to match all <a> nodes that are not descendants of a table. I tried som...

Are there any differences between decimal.Negate(myDecimal) and myDecimal * -1 (except maybe readability)?

In Ruby, the operation of point - 20 # treating it as point - (20,20) 20 - point # treating it as (20,20) - point are to be implemented. But the following code: class Point attr_accessor :x,...